If you’re in the market for a better thermostat, you should know the new, second-generation Nest Learning Thermostat was announced this week. It’s 20% thinner and works in 95% of homes with low-voltage systems (including 2nd stage cooling, 3rd stage heating, dual fuel, emergency heat, and whole-home humidifiers and dehumidifiers), thanks to new hardware, improved software, more features, and more apps. Based on updated pricing, the first Nest is now selling for $229, as supplies last, and the new Nest is selling for $249, with first orders expected to ship on October 15, 2012.